Machine for ramming oval concrete pipes



R. LAST. MACHINE FOR RAMMING OVAL CONCRETE PIPES. APPLICATION FILED JULY l2. I921.

Y 1,410,021 Patented Mar. 21, 1922.

2 SHEETS-SHEET l- INVENTOR Ran-KENT LA R. LAST. MACHINE FOR RAMMING OVAL CONCRETE PIPES. APPLICATION FILED JULY 12. I921.

' 1,410,021 Patented Mar. 21, 1922.

2 SHEETS-SHEET 2.

' a 4 5 6 I 00000 pan 0 .8

INVENTOR RIIKENT LAsT hAs/VTTOR VE K UNITED STATES PATENT OFFICE.

MACHINE FOR RAMMING OVAL CONCRETE PIPES.

Specification of Letters Patent. Patented lvla 21, 1922.

Application filed July 12, 1921. Serial No. 484,176.

1 '0 all whom it may concern:

Be it known that I, RIJKENT LAST, manufacturer, a subject of the Queen of the Netherlands, residing at Enkhuizen, in the Province of North Holland, Kingdom of the Netherlands, have invented certain new and useful Improvements in or Relating to Machines for Hamming Oval Concrete Pipes, of which the following is a specification.

This invention relates to a machine for ramming oval concrete pipes with a rotating ramming mould and with a rammer which is moved up and down by a crank and which is guided in a block movable to and fro in a horizontal direction. The move ment of the block is at the same time de rived from a templet, which is rotated by the main shaft at the same angular velocity and in the same direction as the ramming .mould which is carried by a table adapted to be driven by a shaft.

The usual egg-shaped concrete pipes do not however possess the same thickness of Wall all over, but are provided at the bottom with a fiat foot, in such a manner, that although the internal periphery of the pipe is egg-shaped, the external periphery has'two projecting angles.

In the hitherto known machines for ramming concrete pipes, in whichthe shape of 10 the templet which moves the rammer block corresponds to the internal periphery of the pipe, the disadvantage arises that the said angles are not rammed, so that they easily break off when the pipe is removed from the machine. If however the templet be given the shape of the external periphery of the pipe, the strip of material next the internal periphery at the lower part of the pipe is not rammed, so that breakage at this point is to be feared.

The object of this invention is therefore to' avoid this disadvantage, which object is attained by making the device (i. e.-the templet) which moves the rammer block to and fro, of two parts which correspond in shape with the internal and external peripheries respectively of the article which is to be produced and by providing means which compel the rammer block to alternately follow first one and then the other part of the said device.

The accompanying drawings show an example of a constructional form of the subject matter of the invention.

t Figure 1 shows the same in plan.

Figure 2 is an elevation and Figure 3 shows a detail.

As in the known machines of this kind the block which guides therammer is movable in ahorizontal direction on the frame of the machine and is provided with roller l which is constantly held in contact with the periphery of a templet 3 by the counterweight 2. This templet consists of two parts fixed upon each other and one of which is of the shape of the internal periphery and the same angular velocity and in the same direction as the ramming mould.

A lever 6 consisting of two bars is pivotally connected to the sleeve 4 and can be rocked about horizontal pins 7 fixed on the frame of the machine.

The free end of the lever 6 carries an adtwo bars of the double lever16 is mounted a rotating roller 9, which is continually held in contact with the periphery of a'cam disc (Fig. 3), under the action of the weight 8 that controls the templet 3 and the sleeve 4. The disc 10 is fixed on the horizontal shaft 13 which is driven by bevel wheels off the main shaft 5, the ratio of transmission being such that the number of revolutions made by the disc 10 is only half as great as those of the templet 3. The disc 10 is so shaped that each time the common generat-rix is situated opposite the roller 1, the templet 3 is raised by the action of the weight 8, respectively is lowered by reason of the roller 9 being raised whenit passes from the portion 11 of the disc 10, which has the smallest radius, to the portion 12 having the largest radius. Assuming that in Fig. 1 the roller 1 is in contact with the upper part of the templet 3, it will move during a revolution of the rammer mould and therefore of justable counterweight 8, whilebetween' the 1 the templet along the upper edge thereof and this movement the roller 9 is in com again opposite the roller 1, the roller 9 passes to the portion 11 of the disc, sothat the lever 6 rocks under the action of the weight 8 and the templet. is moved upwards.

The roller 1 now lies on the lower part of the templet and must during the next r0- tation follow the periphery of this part so that the rammer moves along theexternal periphery of the ramming mould. At the end of the second revolution the roller 91 and consequently the lever 6 will be raised by the portion 12 of the diisc'lO and the templet is loweredagain. The parts are then situated in I the original position 1 again.

It will be seen from the above description that during the working of the machine the rammer alternately follows the internal and external peripheries of. the ramming mould, so that the whole of the materials is suffi ciently rammed in order to produce a satisfactory product.

a hat I claim is:

7 1; In afmachine for ramming concrete bers.

movement of the block.

3. In a machine for ramming concrete pipes,'a ramming block, a templet therefor comprising superposed guide members, and means formoving said templet to cause the guide members to alternately control the 4:. In a machine for ramming concrete pipes, in rammingblock, a roller carried thereby, a templet having superposed guide surfaces adapted to be engaged by the roller, and means for raising and lowering the templet to cause the roller to alternately engage said guidesurfaces. i

5.111 a machine for ramming concrete pipes, a ramming block, a guide therefor comprising superposed members correspondingin shape respectively to the internal and external peripheries of the "pipe being rammed, parts of the side faces of said members being flush with each other, and means for causing the blockto alternately engage and follow 'said' members. V

6; In a machine for ramming concrete pipes, aramming"block, a guide therefor comprising members corresponding in shape respectively to the "internal and external peripheries or the pipe being rammed, a rotatable shaft on Which said guide is mounted, a leyerpivotally connected to said guide,

and a cam for actuating Said lever to' move the guide in relation to the block. In testimony Whereofl'I aflix my signature.

' v V RIJKENT LAST;

lVitnessestf y "J. STANFORD EDWARDS,

(LT. KUYPERL. 

